<template>
    <div :class="className" :style="{height:height,width:width}" />
</template>
<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'
export default {
    props: {
        className: {
            type: String,
            default: 'chart'
        },
        width: {
            type: String,
            default: '100%'
        },
        height: {
            type: String,
            default: '350px'
        },
        autoResize: {
            type: Boolean,
            default: true
        },
        chartData: {
            type: Object,
            required: true
        }
    },
    data() {
        return {
            chart: null,
            sidebarElm: null
        }
    },
    watch: {
        chartData: {
            deep: true,
            handler(val) {
                this.setOptions(val)
            }
        }
    },
    mounted() {
        this.initChart()
        if (this.autoResize) {
            this.__resizeHandler = debounce(() => {
                if (this.chart) {
                    this.chart.resize()
                }
            }, 100)
            window.addEventListener('resize', this.__resizeHandler)
        }
        // 监听侧边栏的变化
        this.sidebarElm = document.getElementsByClassName('sidebar-container')[0]
        this.sidebarElm && this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
    },
    beforeDestroy() {
        if (!this.chart) {
            return
        }
        if (this.autoResize) {
            window.removeEventListener('resize', this.__resizeHandler)
        }
        this.sidebarElm && this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)
        this.chart.dispose()
        this.chart = null
    },
    methods: {
        sidebarResizeHandler(e) {
            if (e.propertyName === 'width') {
                this.__resizeHandler()
            }
        },
        setOptions({ expectedData, actualData } = {}) {
            this.chart.setOption({
                xAxis: {
                    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
                    boundaryGap: false,
                    axisTick: {
                        show: false
                    }
                },
                grid: {
                    left: 10,
                    right: 10,
                    bottom: 20,
                    top: 30,
                    containLabel: true
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross'
                    },
                    padding: [5, 10]
                },
                yAxis: {
                    axisTick: {
                        show: false
                    }
                },
                legend: {
                    data: ['expected', 'actual']
                },
                series: [{
                        name: 'expected',
                        itemStyle: {
                            normal: {
                                color: '#FF005A',
                                lineStyle: {
                                    color: '#FF005A',
                                    width: 2
                                }
                            }
                        },
                        smooth: true,
                        type: 'line',
                        data: expectedData,
                        animationDuration: 2800,
                        animationEasing: 'cubicInOut'
                    },
                    {
                        name: 'actual',
                        smooth: true,
                        type: 'line',
                        itemStyle: {
                            normal: {
                                color: '#3888fa',
                                lineStyle: {
                                    color: '#3888fa',
                                    width: 2
                                },
                                areaStyle: {
                                    color: '#f3f8ff'
                                }
                            }
                        },
                        data: actualData,
                        animationDuration: 2800,
                        animationEasing: 'quadraticOut'
                    }
                ]
            })
        },
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons')
            this.setOptions(this.chartData)
        }
    }
}

</script>
